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Motor drive apparatus driving 3-phase brushless motor without using hall sensor

一种马达驱动、三相的技术，应用在电子换向器、转矩脉动控制、电子换向电动机控制等方向，能够解决难以进行马达控制、不能准确检出零交越点、掩蔽期间变短等问题，达到准确检出的效果

Inactive Publication Date: 2006-08-09
RENESAS TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the energization angle of one phase is close to 180 degrees from 120 degrees, the settable masking period will be shortened
In addition, when the coil constant of the motor becomes larger, the attenuation of the coil current becomes slower, and the coil current cannot be brought to 0A until the zero crossing point is detected.
In this case, the zero-crossing point cannot be accurately detected, and motor control is difficult

Method used

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  • Motor drive apparatus driving 3-phase brushless motor without using hall sensor
  • Motor drive apparatus driving 3-phase brushless motor without using hall sensor
  • Motor drive apparatus driving 3-phase brushless motor without using hall sensor

Examples

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Embodiment Construction

[0016] figure 1 It is a block diagram showing the configuration of a motor drive device 1 according to an embodiment of the present invention. figure 1 Among them, the motor driving device 1 includes: an output circuit 2, a comparison circuit 3, a current zero ampere (0A) detection circuit 7, a position detection circuit 8, a non-inductive drive operation circuit 9, a noise reduction current waveform generation circuit 11, a signal Combining circuit 12 and output transistor control circuit 13, the motor drive device 1 drives a three-phase brushless motor 21 without Hall sensors. The motor driver 1 is formed of one IC.

[0017] The three-phase brushless motor 21 includes a stator 22 and a rotor 23 freely rotatably provided therearound. Stator 22 includes U-phase, V-phase, and W-phase coils that are Y-connected. One ends of the coils of the U-phase, V-phase, and W-phase are respectively connected to the coil terminals TU, TV, and TW of the U-phase, V-phase, and W-phase, and t...

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Abstract

A motor drive apparatus includes a comparison circuit comparing voltages of 3-phase coil terminals and the voltage of a neutral point terminal of a 3-phase brushless motor to determine which voltage is higher / lower, a zero ampere current detection circuit detecting, based on the comparison result by the comparison circuit, that the coil current of a position detection phase becomes 0 A, a position detection circuit detecting a zero cross point of the voltage of the position detection phase based on the comparison result by the comparison circuit after the coil current becomes 0 A. Therefore, the zero cross point can be accurately detected without introducing a mask period.

Description

technical field [0001] The present invention relates to a motor drive device, in particular to a motor drive device that drives a three-phase brushless motor without a Hall sensor. Background technique [0002] Conventionally, there is known a motor drive device that drives a three-phase brushless motor without using a Hall sensor. In this motor drive device, the rotational position of the rotor is detected by using the induced voltage generated in the coil of the stator due to the rotation of the rotor, instead of detecting the rotational position of the rotor by the Hall sensor, and based on the detection result, the three-phase Three-phase PWM voltages with a phase shift of 120 degrees are applied to the coils (for example, refer to Japanese Patent Application Laid-Open No. 2003-047280). [0003] More specifically, in such a motor drive device, the current supplied to the coil of the position detection phase is cut off at a predetermined timing, and the zero crossing poi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18H02P6/06H02P6/08H02P6/182
CPCH02P6/182H02P6/10
Inventor 鸣海聪玉川浩之
Owner RENESAS TECH CORP
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